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   1 /*
   2  *   fs/cifs/readdir.c
   3  *
   4  *   Directory search handling
   5  *
   6  *   Copyright (C) International Business Machines  Corp., 2004, 2005
   7  *   Author(s): Steve French (sfrench@us.ibm.com)
   8  *
   9  *   This library is free software; you can redistribute it and/or modify
  10  *   it under the terms of the GNU Lesser General Public License as published
  11  *   by the Free Software Foundation; either version 2.1 of the License, or
  12  *   (at your option) any later version.
  13  *
  14  *   This library is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  17  *   the GNU Lesser General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU Lesser General Public License
  20  *   along with this library; if not, write to the Free Software
  21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23 #include <linux/fs.h>
  24 #include <linux/stat.h>
  25 #include <linux/smp_lock.h>
  26 #include "cifspdu.h"
  27 #include "cifsglob.h"
  28 #include "cifsproto.h"
  29 #include "cifs_unicode.h"
  30 #include "cifs_debug.h"
  31 #include "cifs_fs_sb.h"
  32 #include "cifsfs.h"
  33
  34 #ifdef CONFIG_CIFS_DEBUG2
  35 static void dump_cifs_file_struct(struct file *file, char *label)
  36 {
  37         struct cifsFileInfo * cf;
  38
  39         if(file) {
  40                 cf = file->private_data;
  41                 if(cf == NULL) {
  42                         cFYI(1,("empty cifs private file data"));
  43                         return;
  44                 }
  45                 if(cf->invalidHandle) {
  46                         cFYI(1,("invalid handle"));
  47                 }
  48                 if(cf->srch_inf.endOfSearch) {
  49                         cFYI(1,("end of search"));
  50                 }
  51                 if(cf->srch_inf.emptyDir) {
  52                         cFYI(1,("empty dir"));
  53                 }
  54
  55         }
  56 }
  57 #endif /* DEBUG2 */
  58
  59 /* Returns one if new inode created (which therefore needs to be hashed) */
  60 /* Might check in the future if inode number changed so we can rehash inode */
  61 static int construct_dentry(struct qstr *qstring, struct file *file,
  62         struct inode **ptmp_inode, struct dentry **pnew_dentry)
  63 {
  64         struct dentry *tmp_dentry;
  65         struct cifs_sb_info *cifs_sb;
  66         struct cifsTconInfo *pTcon;
  67         int rc = 0;
  68
  69         cFYI(1, ("For %s", qstring->name));
  70         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
  71         pTcon = cifs_sb->tcon;
  72
  73         qstring->hash = full_name_hash(qstring->name, qstring->len);
  74         tmp_dentry = d_lookup(file->f_dentry, qstring);
  75         if (tmp_dentry) {
  76                 cFYI(0, ("existing dentry with inode 0x%p", tmp_dentry->d_inode));
  77                 *ptmp_inode = tmp_dentry->d_inode;
  78 /* BB overwrite old name? i.e. tmp_dentry->d_name and tmp_dentry->d_name.len??*/
  79                 if(*ptmp_inode == NULL) {
  80                         *ptmp_inode = new_inode(file->f_dentry->d_sb);
  81                         if(*ptmp_inode == NULL)
  82                                 return rc;
  83                         rc = 1;
  84                         d_instantiate(tmp_dentry, *ptmp_inode);
  85                 }
  86         } else {
  87                 tmp_dentry = d_alloc(file->f_dentry, qstring);
  88                 if(tmp_dentry == NULL) {
  89                         cERROR(1,("Failed allocating dentry"));
  90                         *ptmp_inode = NULL;
  91                         return rc;
  92                 }
  93
  94                 *ptmp_inode = new_inode(file->f_dentry->d_sb);
  95                 if (pTcon->nocase)
  96                         tmp_dentry->d_op = &cifs_ci_dentry_ops;
  97                 else
  98                         tmp_dentry->d_op = &cifs_dentry_ops;
  99                 if(*ptmp_inode == NULL)
 100                         return rc;
 101                 rc = 1;
 102                 d_instantiate(tmp_dentry, *ptmp_inode);
 103                 d_rehash(tmp_dentry);
 104         }
 105
 106         tmp_dentry->d_time = jiffies;
 107         *pnew_dentry = tmp_dentry;
 108         return rc;
 109 }
 110
 111 static void fill_in_inode(struct inode *tmp_inode,
 112         FILE_DIRECTORY_INFO *pfindData, int *pobject_type, int isNewInode)
 113 {
 114         loff_t local_size;
 115         struct timespec local_mtime;
 116
 117         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 118         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 119         __u32 attr = le32_to_cpu(pfindData->ExtFileAttributes);
 120         __u64 allocation_size = le64_to_cpu(pfindData->AllocationSize);
 121         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 122
 123         cifsInfo->cifsAttrs = attr;
 124         cifsInfo->time = jiffies;
 125
 126         /* save mtime and size */
 127         local_mtime = tmp_inode->i_mtime;
 128         local_size  = tmp_inode->i_size;
 129
 130         /* Linux can not store file creation time unfortunately so ignore it */
 131         tmp_inode->i_atime =
 132             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 133         tmp_inode->i_mtime =
 134             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
 135         tmp_inode->i_ctime =
 136             cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
 137         /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
 138         /* 2767 perms - indicate mandatory locking */
 139                 /* BB fill in uid and gid here? with help from winbind?
 140                    or retrieve from NTFS stream extended attribute */
 141         if (atomic_read(&cifsInfo->inUse) == 0) {
 142                 tmp_inode->i_uid = cifs_sb->mnt_uid;
 143                 tmp_inode->i_gid = cifs_sb->mnt_gid;
 144                 /* set default mode. will override for dirs below */
 145                 tmp_inode->i_mode = cifs_sb->mnt_file_mode;
 146         } else {
 147                 /* mask off the type bits since it gets set
 148                 below and we do not want to get two type
 149                 bits set */
 150                 tmp_inode->i_mode &= ~S_IFMT;
 151         }
 152
 153         if (attr & ATTR_DIRECTORY) {
 154                 *pobject_type = DT_DIR;
 155                 /* override default perms since we do not lock dirs */
 156                 if(atomic_read(&cifsInfo->inUse) == 0) {
 157                         tmp_inode->i_mode = cifs_sb->mnt_dir_mode;
 158                 }
 159                 tmp_inode->i_mode |= S_IFDIR;
 160         } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
 161                    (attr & ATTR_SYSTEM)) {
 162                 if (end_of_file == 0)  {
 163                         *pobject_type = DT_FIFO;
 164                         tmp_inode->i_mode |= S_IFIFO;
 165                 } else {
 166                         /* rather than get the type here, we mark the
 167                         inode as needing revalidate and get the real type
 168                         (blk vs chr vs. symlink) later ie in lookup */
 169                         *pobject_type = DT_REG;
 170                         tmp_inode->i_mode |= S_IFREG;
 171                         cifsInfo->time = 0;
 172                 }
 173 /* we no longer mark these because we could not follow them */
 174 /*        } else if (attr & ATTR_REPARSE) {
 175                 *pobject_type = DT_LNK;
 176                 tmp_inode->i_mode |= S_IFLNK; */
 177         } else {
 178                 *pobject_type = DT_REG;
 179                 tmp_inode->i_mode |= S_IFREG;
 180                 if (attr & ATTR_READONLY)
 181                         tmp_inode->i_mode &= ~(S_IWUGO);
 182         } /* could add code here - to validate if device or weird share type? */
 183
 184         /* can not fill in nlink here as in qpathinfo version and Unx search */
 185         if (atomic_read(&cifsInfo->inUse) == 0) {
 186                 atomic_set(&cifsInfo->inUse, 1);
 187         }
 188
 189         if (is_size_safe_to_change(cifsInfo)) {
 190                 /* can not safely change the file size here if the
 191                 client is writing to it due to potential races */
 192                 i_size_write(tmp_inode, end_of_file);
 193
 194         /* 512 bytes (2**9) is the fake blocksize that must be used */
 195         /* for this calculation, even though the reported blocksize is larger */
 196                 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
 197         }
 198
 199         if (allocation_size < end_of_file)
 200                 cFYI(1, ("May be sparse file, allocation less than file size"));
 201         cFYI(1, ("File Size %ld and blocks %llu and blocksize %ld",
 202                 (unsigned long)tmp_inode->i_size,
 203                 (unsigned long long)tmp_inode->i_blocks,
 204                 tmp_inode->i_blksize));
 205         if (S_ISREG(tmp_inode->i_mode)) {
 206                 cFYI(1, ("File inode"));
 207                 tmp_inode->i_op = &cifs_file_inode_ops;
 208                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 209                         if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 210                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
 211                         else
 212                                 tmp_inode->i_fop = &cifs_file_direct_ops;
 213
 214                 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 215                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
 216                 else
 217                         tmp_inode->i_fop = &cifs_file_ops;
 218
 219                 tmp_inode->i_data.a_ops = &cifs_addr_ops;
 220                 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
 221                    (cifs_sb->tcon->ses->server->maxBuf <
 222                         4096 + MAX_CIFS_HDR_SIZE))
 223                         tmp_inode->i_data.a_ops->readpages = NULL;
 224                 if(isNewInode)
 225                         return; /* No sense invalidating pages for new inode
 226                                    since have not started caching readahead file
 227                                    data yet */
 228
 229                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 230                         (local_size == tmp_inode->i_size)) {
 231                         cFYI(1, ("inode exists but unchanged"));
 232                 } else {
 233                         /* file may have changed on server */
 234                         cFYI(1, ("invalidate inode, readdir detected change"));
 235                         invalidate_remote_inode(tmp_inode);
 236                 }
 237         } else if (S_ISDIR(tmp_inode->i_mode)) {
 238                 cFYI(1, ("Directory inode"));
 239                 tmp_inode->i_op = &cifs_dir_inode_ops;
 240                 tmp_inode->i_fop = &cifs_dir_ops;
 241         } else if (S_ISLNK(tmp_inode->i_mode)) {
 242                 cFYI(1, ("Symbolic Link inode"));
 243                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 244         } else {
 245                 cFYI(1, ("Init special inode"));
 246                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 247                                    tmp_inode->i_rdev);
 248         }
 249 }
 250
 251 static void unix_fill_in_inode(struct inode *tmp_inode,
 252         FILE_UNIX_INFO *pfindData, int *pobject_type, int isNewInode)
 253 {
 254         loff_t local_size;
 255         struct timespec local_mtime;
 256
 257         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
 258         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
 259
 260         __u32 type = le32_to_cpu(pfindData->Type);
 261         __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
 262         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
 263         cifsInfo->time = jiffies;
 264         atomic_inc(&cifsInfo->inUse);
 265
 266         /* save mtime and size */
 267         local_mtime = tmp_inode->i_mtime;
 268         local_size  = tmp_inode->i_size;
 269
 270         tmp_inode->i_atime =
 271             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
 272         tmp_inode->i_mtime =
 273             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
 274         tmp_inode->i_ctime =
 275             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
 276
 277         tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
 278         /* since we set the inode type below we need to mask off type
 279            to avoid strange results if bits above were corrupt */
 280         tmp_inode->i_mode &= ~S_IFMT;
 281         if (type == UNIX_FILE) {
 282                 *pobject_type = DT_REG;
 283                 tmp_inode->i_mode |= S_IFREG;
 284         } else if (type == UNIX_SYMLINK) {
 285                 *pobject_type = DT_LNK;
 286                 tmp_inode->i_mode |= S_IFLNK;
 287         } else if (type == UNIX_DIR) {
 288                 *pobject_type = DT_DIR;
 289                 tmp_inode->i_mode |= S_IFDIR;
 290         } else if (type == UNIX_CHARDEV) {
 291                 *pobject_type = DT_CHR;
 292                 tmp_inode->i_mode |= S_IFCHR;
 293                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 294                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 295         } else if (type == UNIX_BLOCKDEV) {
 296                 *pobject_type = DT_BLK;
 297                 tmp_inode->i_mode |= S_IFBLK;
 298                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
 299                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
 300         } else if (type == UNIX_FIFO) {
 301                 *pobject_type = DT_FIFO;
 302                 tmp_inode->i_mode |= S_IFIFO;
 303         } else if (type == UNIX_SOCKET) {
 304                 *pobject_type = DT_SOCK;
 305                 tmp_inode->i_mode |= S_IFSOCK;
 306         } else {
 307                 /* safest to just call it a file */
 308                 *pobject_type = DT_REG;
 309                 tmp_inode->i_mode |= S_IFREG;
 310                 cFYI(1,("unknown inode type %d",type));
 311         }
 312
 313         tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
 314         tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
 315         tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
 316
 317         if (is_size_safe_to_change(cifsInfo)) {
 318                 /* can not safely change the file size here if the
 319                 client is writing to it due to potential races */
 320                 i_size_write(tmp_inode,end_of_file);
 321
 322         /* 512 bytes (2**9) is the fake blocksize that must be used */
 323         /* for this calculation, not the real blocksize */
 324                 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
 325         }
 326
 327         if (S_ISREG(tmp_inode->i_mode)) {
 328                 cFYI(1, ("File inode"));
 329                 tmp_inode->i_op = &cifs_file_inode_ops;
 330
 331                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
 332                         if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 333                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
 334                         else
 335                                 tmp_inode->i_fop = &cifs_file_direct_ops;
 336
 337                 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 338                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
 339                 else
 340                         tmp_inode->i_fop = &cifs_file_ops;
 341
 342                 tmp_inode->i_data.a_ops = &cifs_addr_ops;
 343                 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
 344                    (cifs_sb->tcon->ses->server->maxBuf <
 345                         4096 + MAX_CIFS_HDR_SIZE))
 346                         tmp_inode->i_data.a_ops->readpages = NULL;
 347
 348                 if(isNewInode)
 349                         return; /* No sense invalidating pages for new inode since we
 350                                            have not started caching readahead file data yet */
 351
 352                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
 353                         (local_size == tmp_inode->i_size)) {
 354                         cFYI(1, ("inode exists but unchanged"));
 355                 } else {
 356                         /* file may have changed on server */
 357                         cFYI(1, ("invalidate inode, readdir detected change"));
 358                         invalidate_remote_inode(tmp_inode);
 359                 }
 360         } else if (S_ISDIR(tmp_inode->i_mode)) {
 361                 cFYI(1, ("Directory inode"));
 362                 tmp_inode->i_op = &cifs_dir_inode_ops;
 363                 tmp_inode->i_fop = &cifs_dir_ops;
 364         } else if (S_ISLNK(tmp_inode->i_mode)) {
 365                 cFYI(1, ("Symbolic Link inode"));
 366                 tmp_inode->i_op = &cifs_symlink_inode_ops;
 367 /* tmp_inode->i_fop = *//* do not need to set to anything */
 368         } else {
 369                 cFYI(1, ("Special inode"));
 370                 init_special_inode(tmp_inode, tmp_inode->i_mode,
 371                                    tmp_inode->i_rdev);
 372         }
 373 }
 374
 375 static int initiate_cifs_search(const int xid, struct file *file)
 376 {
 377         int rc = 0;
 378         char * full_path;
 379         struct cifsFileInfo * cifsFile;
 380         struct cifs_sb_info *cifs_sb;
 381         struct cifsTconInfo *pTcon;
 382
 383         if(file->private_data == NULL) {
 384                 file->private_data =
 385                         kmalloc(sizeof(struct cifsFileInfo),GFP_KERNEL);
 386         }
 387
 388         if(file->private_data == NULL) {
 389                 return -ENOMEM;
 390         } else {
 391                 memset(file->private_data,0,sizeof(struct cifsFileInfo));
 392         }
 393         cifsFile = file->private_data;
 394         cifsFile->invalidHandle = TRUE;
 395         cifsFile->srch_inf.endOfSearch = FALSE;
 396
 397         if(file->f_dentry == NULL)
 398                 return -ENOENT;
 399
 400         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 401         if(cifs_sb == NULL)
 402                 return -EINVAL;
 403
 404         pTcon = cifs_sb->tcon;
 405         if(pTcon == NULL)
 406                 return -EINVAL;
 407
 408         full_path = build_path_from_dentry(file->f_dentry);
 409
 410         if(full_path == NULL) {
 411                 return -ENOMEM;
 412         }
 413
 414         cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
 415
 416 ffirst_retry:
 417         /* test for Unix extensions */
 418         if (pTcon->ses->capabilities & CAP_UNIX) {
 419                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
 420         } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 421                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
 422         } else /* not srvinos - BB fixme add check for backlevel? */ {
 423                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
 424         }
 425
 426         rc = CIFSFindFirst(xid, pTcon,full_path,cifs_sb->local_nls,
 427                 &cifsFile->netfid, &cifsFile->srch_inf,
 428                 cifs_sb->mnt_cifs_flags &
 429                         CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
 430         if(rc == 0)
 431                 cifsFile->invalidHandle = FALSE;
 432         if((rc == -EOPNOTSUPP) &&
 433                 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
 434                 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
 435                 goto ffirst_retry;
 436         }
 437         kfree(full_path);
 438         return rc;
 439 }
 440
 441 /* return length of unicode string in bytes */
 442 static int cifs_unicode_bytelen(char *str)
 443 {
 444         int len;
 445         __le16 * ustr = (__le16 *)str;
 446
 447         for(len=0;len <= PATH_MAX;len++) {
 448                 if(ustr[len] == 0)
 449                         return len << 1;
 450         }
 451         cFYI(1,("Unicode string longer than PATH_MAX found"));
 452         return len << 1;
 453 }
 454
 455 static char *nxt_dir_entry(char *old_entry, char *end_of_smb)
 456 {
 457         char * new_entry;
 458         FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
 459
 460         new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
 461         cFYI(1,("new entry %p old entry %p",new_entry,old_entry));
 462         /* validate that new_entry is not past end of SMB */
 463         if(new_entry >= end_of_smb) {
 464                 cERROR(1,
 465                       ("search entry %p began after end of SMB %p old entry %p",
 466                         new_entry, end_of_smb, old_entry));
 467                 return NULL;
 468         } else if (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb) {
 469                 cERROR(1,("search entry %p extends after end of SMB %p",
 470                         new_entry, end_of_smb));
 471                 return NULL;
 472         } else
 473                 return new_entry;
 474
 475 }
 476
 477 #define UNICODE_DOT cpu_to_le16(0x2e)
 478
 479 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
 480 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
 481 {
 482         int rc = 0;
 483         char * filename = NULL;
 484         int len = 0;
 485
 486         if(cfile->srch_inf.info_level == 0x202) {
 487                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 488                 filename = &pFindData->FileName[0];
 489                 if(cfile->srch_inf.unicode) {
 490                         len = cifs_unicode_bytelen(filename);
 491                 } else {
 492                         /* BB should we make this strnlen of PATH_MAX? */
 493                         len = strnlen(filename, 5);
 494                 }
 495         } else if(cfile->srch_inf.info_level == 0x101) {
 496                 FILE_DIRECTORY_INFO * pFindData =
 497                         (FILE_DIRECTORY_INFO *)current_entry;
 498                 filename = &pFindData->FileName[0];
 499                 len = le32_to_cpu(pFindData->FileNameLength);
 500         } else if(cfile->srch_inf.info_level == 0x102) {
 501                 FILE_FULL_DIRECTORY_INFO * pFindData =
 502                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 503                 filename = &pFindData->FileName[0];
 504                 len = le32_to_cpu(pFindData->FileNameLength);
 505         } else if(cfile->srch_inf.info_level == 0x105) {
 506                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 507                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 508                 filename = &pFindData->FileName[0];
 509                 len = le32_to_cpu(pFindData->FileNameLength);
 510         } else if(cfile->srch_inf.info_level == 0x104) {
 511                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 512                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 513                 filename = &pFindData->FileName[0];
 514                 len = le32_to_cpu(pFindData->FileNameLength);
 515         } else {
 516                 cFYI(1,("Unknown findfirst level %d",cfile->srch_inf.info_level));
 517         }
 518
 519         if(filename) {
 520                 if(cfile->srch_inf.unicode) {
 521                         __le16 *ufilename = (__le16 *)filename;
 522                         if(len == 2) {
 523                                 /* check for . */
 524                                 if(ufilename[0] == UNICODE_DOT)
 525                                         rc = 1;
 526                         } else if(len == 4) {
 527                                 /* check for .. */
 528                                 if((ufilename[0] == UNICODE_DOT)
 529                                    &&(ufilename[1] == UNICODE_DOT))
 530                                         rc = 2;
 531                         }
 532                 } else /* ASCII */ {
 533                         if(len == 1) {
 534                                 if(filename[0] == '.')
 535                                         rc = 1;
 536                         } else if(len == 2) {
 537                                 if((filename[0] == '.') && (filename[1] == '.'))
 538                                         rc = 2;
 539                         }
 540                 }
 541         }
 542
 543         return rc;
 544 }
 545
 546 /* Check if directory that we are searching has changed so we can decide
 547    whether we can use the cached search results from the previous search */
 548 static int is_dir_changed(struct file * file)
 549 {
 550         struct inode * inode;
 551         struct cifsInodeInfo *cifsInfo;
 552
 553         if(file->f_dentry == NULL)
 554                 return 0;
 555
 556         inode = file->f_dentry->d_inode;
 557
 558         if(inode == NULL)
 559                 return 0;
 560
 561         cifsInfo = CIFS_I(inode);
 562
 563         if(cifsInfo->time == 0)
 564                 return 1; /* directory was changed, perhaps due to unlink */
 565         else
 566                 return 0;
 567
 568 }
 569
 570 /* find the corresponding entry in the search */
 571 /* Note that the SMB server returns search entries for . and .. which
 572    complicates logic here if we choose to parse for them and we do not
 573    assume that they are located in the findfirst return buffer.*/
 574 /* We start counting in the buffer with entry 2 and increment for every
 575    entry (do not increment for . or .. entry) */
 576 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
 577         struct file *file, char **ppCurrentEntry, int *num_to_ret)
 578 {
 579         int rc = 0;
 580         int pos_in_buf = 0;
 581         loff_t first_entry_in_buffer;
 582         loff_t index_to_find = file->f_pos;
 583         struct cifsFileInfo * cifsFile = file->private_data;
 584         /* check if index in the buffer */
 585
 586         if((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
 587            (num_to_ret == NULL))
 588                 return -ENOENT;
 589
 590         *ppCurrentEntry = NULL;
 591         first_entry_in_buffer =
 592                 cifsFile->srch_inf.index_of_last_entry -
 593                         cifsFile->srch_inf.entries_in_buffer;
 594
 595         /* if first entry in buf is zero then is first buffer
 596         in search response data which means it is likely . and ..
 597         will be in this buffer, although some servers do not return
 598         . and .. for the root of a drive and for those we need
 599         to start two entries earlier */
 600
 601 #ifdef CONFIG_CIFS_DEBUG2
 602         dump_cifs_file_struct(file, "In fce ");
 603 #endif
 604         if(((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
 605              is_dir_changed(file)) ||
 606            (index_to_find < first_entry_in_buffer)) {
 607                 /* close and restart search */
 608                 cFYI(1,("search backing up - close and restart search"));
 609                 cifsFile->invalidHandle = TRUE;
 610                 CIFSFindClose(xid, pTcon, cifsFile->netfid);
 611                 kfree(cifsFile->search_resume_name);
 612                 cifsFile->search_resume_name = NULL;
 613                 if(cifsFile->srch_inf.ntwrk_buf_start) {
 614                         cFYI(1,("freeing SMB ff cache buf on search rewind"));
 615                         if(cifsFile->srch_inf.smallBuf)
 616                                 cifs_small_buf_release(cifsFile->srch_inf.
 617                                                 ntwrk_buf_start);
 618                         else
 619                                 cifs_buf_release(cifsFile->srch_inf.
 620                                                 ntwrk_buf_start);
 621                 }
 622                 rc = initiate_cifs_search(xid,file);
 623                 if(rc) {
 624                         cFYI(1,("error %d reinitiating a search on rewind",rc));
 625                         return rc;
 626                 }
 627         }
 628
 629         while((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
 630               (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)){
 631                 cFYI(1,("calling findnext2"));
 632                 rc = CIFSFindNext(xid,pTcon,cifsFile->netfid,
 633                                   &cifsFile->srch_inf);
 634                 if(rc)
 635                         return -ENOENT;
 636         }
 637         if(index_to_find < cifsFile->srch_inf.index_of_last_entry) {
 638                 /* we found the buffer that contains the entry */
 639                 /* scan and find it */
 640                 int i;
 641                 char * current_entry;
 642                 char * end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
 643                         smbCalcSize((struct smb_hdr *)
 644                                 cifsFile->srch_inf.ntwrk_buf_start);
 645
 646                 current_entry = cifsFile->srch_inf.srch_entries_start;
 647                 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
 648                                         - cifsFile->srch_inf.entries_in_buffer;
 649                 pos_in_buf = index_to_find - first_entry_in_buffer;
 650                 cFYI(1,("found entry - pos_in_buf %d",pos_in_buf));
 651                 for(i=0;(i<(pos_in_buf)) && (current_entry != NULL);i++) {
 652                         /* go entry by entry figuring out which is first */
 653                         current_entry = nxt_dir_entry(current_entry,end_of_smb);
 654                 }
 655                 if((current_entry == NULL) && (i < pos_in_buf)) {
 656                         /* BB fixme - check if we should flag this error */
 657                         cERROR(1,("reached end of buf searching for pos in buf"
 658                           " %d index to find %lld rc %d",
 659                           pos_in_buf,index_to_find,rc));
 660                 }
 661                 rc = 0;
 662                 *ppCurrentEntry = current_entry;
 663         } else {
 664                 cFYI(1,("index not in buffer - could not findnext into it"));
 665                 return 0;
 666         }
 667
 668         if(pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
 669                 cFYI(1,("can not return entries pos_in_buf beyond last entry"));
 670                 *num_to_ret = 0;
 671         } else
 672                 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
 673
 674         return rc;
 675 }
 676
 677 /* inode num, inode type and filename returned */
 678 static int cifs_get_name_from_search_buf(struct qstr *pqst,
 679         char *current_entry, __u16 level, unsigned int unicode,
 680         struct cifs_sb_info * cifs_sb, ino_t *pinum)
 681 {
 682         int rc = 0;
 683         unsigned int len = 0;
 684         char * filename;
 685         struct nls_table * nlt = cifs_sb->local_nls;
 686
 687         *pinum = 0;
 688
 689         if(level == SMB_FIND_FILE_UNIX) {
 690                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 691
 692                 filename = &pFindData->FileName[0];
 693                 if(unicode) {
 694                         len = cifs_unicode_bytelen(filename);
 695                 } else {
 696                         /* BB should we make this strnlen of PATH_MAX? */
 697                         len = strnlen(filename, PATH_MAX);
 698                 }
 699
 700                 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB fixme */
 701                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 702                         *pinum = pFindData->UniqueId;
 703         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 704                 FILE_DIRECTORY_INFO * pFindData =
 705                         (FILE_DIRECTORY_INFO *)current_entry;
 706                 filename = &pFindData->FileName[0];
 707                 len = le32_to_cpu(pFindData->FileNameLength);
 708         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 709                 FILE_FULL_DIRECTORY_INFO * pFindData =
 710                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 711                 filename = &pFindData->FileName[0];
 712                 len = le32_to_cpu(pFindData->FileNameLength);
 713         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 714                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 715                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 716                 filename = &pFindData->FileName[0];
 717                 len = le32_to_cpu(pFindData->FileNameLength);
 718                 *pinum = pFindData->UniqueId;
 719         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 720                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 721                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 722                 filename = &pFindData->FileName[0];
 723                 len = le32_to_cpu(pFindData->FileNameLength);
 724         } else {
 725                 cFYI(1,("Unknown findfirst level %d",level));
 726                 return -EINVAL;
 727         }
 728         if(unicode) {
 729                 /* BB fixme - test with long names */
 730                 /* Note converted filename can be longer than in unicode */
 731                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 732                         pqst->len = cifs_convertUCSpath((char *)pqst->name,
 733                                         (__le16 *)filename, len/2, nlt);
 734                 else
 735                         pqst->len = cifs_strfromUCS_le((char *)pqst->name,
 736                                         (__le16 *)filename,len/2,nlt);
 737         } else {
 738                 pqst->name = filename;
 739                 pqst->len = len;
 740         }
 741         pqst->hash = full_name_hash(pqst->name,pqst->len);
 742 /*      cFYI(1,("filldir on %s",pqst->name));  */
 743         return rc;
 744 }
 745
 746 static int cifs_filldir(char *pfindEntry, struct file *file,
 747         filldir_t filldir, void *direntry, char *scratch_buf)
 748 {
 749         int rc = 0;
 750         struct qstr qstring;
 751         struct cifsFileInfo * pCifsF;
 752         unsigned obj_type;
 753         ino_t  inum;
 754         struct cifs_sb_info * cifs_sb;
 755         struct inode *tmp_inode;
 756         struct dentry *tmp_dentry;
 757
 758         /* get filename and len into qstring */
 759         /* get dentry */
 760         /* decide whether to create and populate ionde */
 761         if((direntry == NULL) || (file == NULL))
 762                 return -EINVAL;
 763
 764         pCifsF = file->private_data;
 765
 766         if((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
 767                 return -ENOENT;
 768
 769         if(file->f_dentry == NULL)
 770                 return -ENOENT;
 771
 772         rc = cifs_entry_is_dot(pfindEntry,pCifsF);
 773         /* skip . and .. since we added them first */
 774         if(rc != 0)
 775                 return 0;
 776
 777         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 778
 779         qstring.name = scratch_buf;
 780         rc = cifs_get_name_from_search_buf(&qstring,pfindEntry,
 781                         pCifsF->srch_inf.info_level,
 782                         pCifsF->srch_inf.unicode,cifs_sb,
 783                         &inum /* returned */);
 784
 785         if(rc)
 786                 return rc;
 787
 788         rc = construct_dentry(&qstring,file,&tmp_inode, &tmp_dentry);
 789         if((tmp_inode == NULL) || (tmp_dentry == NULL))
 790                 return -ENOMEM;
 791
 792         if(rc) {
 793                 /* inode created, we need to hash it with right inode number */
 794                 if(inum != 0) {
 795                         /* BB fixme - hash the 2 32 quantities bits together if necessary BB */
 796                         tmp_inode->i_ino = inum;
 797                 }
 798                 insert_inode_hash(tmp_inode);
 799         }
 800
 801         /* we pass in rc below, indicating whether it is a new inode,
 802            so we can figure out whether to invalidate the inode cached
 803            data if the file has changed */
 804         if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
 805                 unix_fill_in_inode(tmp_inode,
 806                                    (FILE_UNIX_INFO *)pfindEntry,&obj_type, rc);
 807         } else {
 808                 fill_in_inode(tmp_inode,
 809                               (FILE_DIRECTORY_INFO *)pfindEntry,&obj_type, rc);
 810         }
 811
 812         rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,
 813                      tmp_inode->i_ino,obj_type);
 814         if(rc) {
 815                 cFYI(1,("filldir rc = %d",rc));
 816         }
 817
 818         dput(tmp_dentry);
 819         return rc;
 820 }
 821
 822 static int cifs_save_resume_key(const char *current_entry,
 823         struct cifsFileInfo *cifsFile)
 824 {
 825         int rc = 0;
 826         unsigned int len = 0;
 827         __u16 level;
 828         char * filename;
 829
 830         if((cifsFile == NULL) || (current_entry == NULL))
 831                 return -EINVAL;
 832
 833         level = cifsFile->srch_inf.info_level;
 834
 835         if(level == SMB_FIND_FILE_UNIX) {
 836                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
 837
 838                 filename = &pFindData->FileName[0];
 839                 if(cifsFile->srch_inf.unicode) {
 840                         len = cifs_unicode_bytelen(filename);
 841                 } else {
 842                         /* BB should we make this strnlen of PATH_MAX? */
 843                         len = strnlen(filename, PATH_MAX);
 844                 }
 845                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
 846         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
 847                 FILE_DIRECTORY_INFO * pFindData =
 848                         (FILE_DIRECTORY_INFO *)current_entry;
 849                 filename = &pFindData->FileName[0];
 850                 len = le32_to_cpu(pFindData->FileNameLength);
 851                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 852         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
 853                 FILE_FULL_DIRECTORY_INFO * pFindData =
 854                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
 855                 filename = &pFindData->FileName[0];
 856                 len = le32_to_cpu(pFindData->FileNameLength);
 857                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 858         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
 859                 SEARCH_ID_FULL_DIR_INFO * pFindData =
 860                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
 861                 filename = &pFindData->FileName[0];
 862                 len = le32_to_cpu(pFindData->FileNameLength);
 863                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 864         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
 865                 FILE_BOTH_DIRECTORY_INFO * pFindData =
 866                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
 867                 filename = &pFindData->FileName[0];
 868                 len = le32_to_cpu(pFindData->FileNameLength);
 869                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
 870         } else {
 871                 cFYI(1,("Unknown findfirst level %d",level));
 872                 return -EINVAL;
 873         }
 874         cifsFile->srch_inf.resume_name_len = len;
 875         cifsFile->srch_inf.presume_name = filename;
 876         return rc;
 877 }
 878
 879 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
 880 {
 881         int rc = 0;
 882         int xid,i;
 883         struct cifs_sb_info *cifs_sb;
 884         struct cifsTconInfo *pTcon;
 885         struct cifsFileInfo *cifsFile = NULL;
 886         char * current_entry;
 887         int num_to_fill = 0;
 888         char * tmp_buf = NULL;
 889         char * end_of_smb;
 890
 891         xid = GetXid();
 892
 893         if(file->f_dentry == NULL) {
 894                 FreeXid(xid);
 895                 return -EIO;
 896         }
 897
 898         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
 899         pTcon = cifs_sb->tcon;
 900         if(pTcon == NULL)
 901                 return -EINVAL;
 902
 903         switch ((int) file->f_pos) {
 904         case 0:
 905                 if (filldir(direntry, ".", 1, file->f_pos,
 906                      file->f_dentry->d_inode->i_ino, DT_DIR) < 0) {
 907                         cERROR(1, ("Filldir for current dir failed"));
 908                         rc = -ENOMEM;
 909                         break;
 910                 }
 911                 file->f_pos++;
 912         case 1:
 913                 if (filldir(direntry, "..", 2, file->f_pos,
 914                      file->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
 915                         cERROR(1, ("Filldir for parent dir failed"));
 916                         rc = -ENOMEM;
 917                         break;
 918                 }
 919                 file->f_pos++;
 920         default:
 921                 /* 1) If search is active,
 922                         is in current search buffer?
 923                         if it before then restart search
 924                         if after then keep searching till find it */
 925
 926                 if(file->private_data == NULL) {
 927                         rc = initiate_cifs_search(xid,file);
 928                         cFYI(1,("initiate cifs search rc %d",rc));
 929                         if(rc) {
 930                                 FreeXid(xid);
 931                                 return rc;
 932                         }
 933                 }
 934                 if(file->private_data == NULL) {
 935                         rc = -EINVAL;
 936                         FreeXid(xid);
 937                         return rc;
 938                 }
 939                 cifsFile = file->private_data;
 940                 if (cifsFile->srch_inf.endOfSearch) {
 941                         if(cifsFile->srch_inf.emptyDir) {
 942                                 cFYI(1, ("End of search, empty dir"));
 943                                 rc = 0;
 944                                 break;
 945                         }
 946                 } /* else {
 947                         cifsFile->invalidHandle = TRUE;
 948                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
 949                 }
 950                 kfree(cifsFile->search_resume_name);
 951                 cifsFile->search_resume_name = NULL; */
 952
 953                 rc = find_cifs_entry(xid,pTcon, file,
 954                                 &current_entry,&num_to_fill);
 955                 if(rc) {
 956                         cFYI(1,("fce error %d",rc));
 957                         goto rddir2_exit;
 958                 } else if (current_entry != NULL) {
 959                         cFYI(1,("entry %lld found",file->f_pos));
 960                 } else {
 961                         cFYI(1,("could not find entry"));
 962                         goto rddir2_exit;
 963                 }
 964                 cFYI(1,("loop through %d times filling dir for net buf %p",
 965                         num_to_fill,cifsFile->srch_inf.ntwrk_buf_start));
 966                 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
 967                         smbCalcSize((struct smb_hdr *)
 968                                     cifsFile->srch_inf.ntwrk_buf_start);
 969                 /* To be safe - for UCS to UTF-8 with strings loaded
 970                 with the rare long characters alloc more to account for
 971                 such multibyte target UTF-8 characters. cifs_unicode.c,
 972                 which actually does the conversion, has the same limit */
 973                 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
 974                 for(i=0;(i<num_to_fill) && (rc == 0);i++) {
 975                         if(current_entry == NULL) {
 976                                 /* evaluate whether this case is an error */
 977                                 cERROR(1,("past end of SMB num to fill %d i %d",
 978                                           num_to_fill, i));
 979                                 break;
 980                         }
 981                         /* if buggy server returns . and .. late do
 982                         we want to check for that here? */
 983                         rc = cifs_filldir(current_entry, file,
 984                                         filldir, direntry,tmp_buf);
 985                         file->f_pos++;
 986                         if(file->f_pos ==
 987                                 cifsFile->srch_inf.index_of_last_entry) {
 988                                 cFYI(1,("last entry in buf at pos %lld %s",
 989                                         file->f_pos,tmp_buf));
 990                                 cifs_save_resume_key(current_entry,cifsFile);
 991                                 break;
 992                         } else
 993                                 current_entry = nxt_dir_entry(current_entry,
 994                                                               end_of_smb);
 995                 }
 996                 kfree(tmp_buf);
 997                 break;
 998         } /* end switch */
 999
1000 rddir2_exit:
1001         FreeXid(xid);
1002         return rc;
1003 }